Simplify DB::Row/Token extraction

Simplify DB::Row/Token extraction

For wrapped key export we need to pass 1 object to be wrapped by
another. GObjUPtr is insufficient as it loses information about the
specific type. We'll need that info in TZ backend.

The wrapping API can be then made look as follows:

RawBuffer GObj::wrap(const CryptoAlgorithm &params,
                     const Token &keyToWrap,
                     const Password &keyToWrapPass);

Change-Id: Ifeea08cbef43c6e86c067e37c68627d6b819bfcf